Cannot save 32 bit PSD file from 32 bit BaseBitmap

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 23/03/2010 at 17:04, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   11.514
Platform:
Language(s) :     C++ ;

---------
Hi Everyone,

I have a plugin that loads a 32 bit tif, but cannot save it as a 32 bit PSD file. Here's the body of the Execute method:

  
Bool   
testPluginCmd::Execute(BaseDocument *doc)   
{   
    String tifPath("~/rawtex/face_tg.tif");   
    String psdPath("~/rawtex/face_tg.psd");   
  
    BaseBitmap *psdSaver = BaseBitmap::Alloc();   
    if (!psdSaver || psdSaver->Init(tifPath) != IMAGE_OK)   
    {   
        GePrint("Fatal: could not load " + tifPath);   
        BaseBitmap::Free(psdSaver);   
        psdSaver = NULL;   
    }   
  
    GePrint("File " + tifPath + " is a");   
    if (psdSaver->GetBt() == 96)   
    {   
        // This prints out, so the file is properly loaded as 32 bits   
        GePrint("     32-bit image");   
    }   
    else if (psdSaver->GetBt() == 48)   
    {   
        GePrint("     16-bit image");   
    }   
    else if (psdSaver->GetBt() == 24)   
    {   
        GePrint("     8-bit image");   
    }   
    else   
    {   
        GePrint("Cannot determine bit depth for loaded tif file: " + tifPath);   
    }   
  
    if (psdSaver && psdSaver->Save(psdPath, FILTER_PSD, NULL, 0) != IMAGE_OK)   
    {   
        GePrint("Fatal: could not convert " + tifPath + " to PSD file");   
    }   
  
    BaseBitmap *psdLoader = BaseBitmap::Alloc();   
    if (!psdLoader || psdLoader->Init(psdPath) != IMAGE_OK)   
    {   
        GePrint("Fatal: could not load " + psdPath);   
        BaseBitmap::Free(psdLoader);   
        psdLoader = NULL;   
    }   
  
    GePrint("File " + psdPath + " is a");   
    if (psdLoader->GetBt() == 96)   
    {   
        GePrint("     32-bit image");   
    }   
    else if (psdLoader->GetBt() == 48)   
    {   
        GePrint("     16-bit image");   
    }   
    else if (psdLoader->GetBt() == 24)   
    {   
        // This prints, the PSD file is 8 bit   
        GePrint("     8-bit image");   
    }   
    else   
    {   
        GePrint("Cannot determine bit depth for loaded psd file: " + psdPath);   
    }   
    BaseBitmap::Free(psdLoader);   
  
    return TRUE;   
}

When the plugin is executed, the tif file is properly loaded into the BaseBitmap and GetBt() returns 96, which indicates a 32 bit image.

When the BaseBitmap is saved as FILTER_PSD, the Save method returns IMAGE_OK, so BaseBitmap::Save is successfully writing the image.

However, when the saved PSD file is loaded, the GetBt method returns 24, indicating an 8 bit image. If the PSD file is loaded into PhotoShop, PhotoShop also reports an 8 bit image.

What am I donig wrong? Any help greatly appreciated, thanks!

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 23/03/2010 at 20:51, xxxxxxxx wrote:

...
if (psdSaver && psdSaver->Save(psdPath, FILTER_PSD, NULL, 0 ) != IMAGE_OK)
...

What am I donig wrong?

Well, as loading in Photoshop demonstrated, you saved your file as 8-bit. So the call to the Save method should have been the first suspect. Indeed a quick check in the SDK docs revealed that you likely should set the parameter savebits to something different than 0

I haven't tested it, but this should work:
if (psdSaver && psdSaver->Save(psdPath, FILTER_PSD, NULL, SAVEBIT_32b**chANNELS ) != IMAGE_OK)

Hope it helps

Kabe

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 23/03/2010 at 20:55, xxxxxxxx wrote:

Political correct constant names

This made my day!

Kabe

Helper

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 24/03/2010 at 10:24, xxxxxxxx wrote:

Oh I see, I misread the documentation. I read the documentation for the "data" parameter, then saw the section on return values and assumed that was the end of it.

Thanks!